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Cable Pulling Tension and Sidewall Pressure

Estimate pull tension for a horizontal straight run followed by an equivalent cable bend, expose the key intermediate tensions, and compare them with user-entered installation limits.

Inputs

Cable and route

Range: 0.01–100 kg/m

Use the installed cable assembly mass per metre, not the mass of a single core if the route pulls a multicore assembly.

Range: 0–10,000 m

This simplified model treats the straight run as horizontal and uses cable weight as the normal force.

Range: 0–2

Enter a value supported by the cable, conduit/tray, lubricant and pulling method. No universal Australian value is assumed.

Range: 0–100,000 N

Use the measured or planned tension at the start of this modelled segment.

Range: 0–720 degrees

Use the total angle represented by the equivalent bend. A 0° input represents no bend and returns zero sidewall pressure.

Range: 0.001–20 m

Use the effective centreline radius of the bend. Check the cable and pulling-equipment minimum radius separately.

Manufacturer limits

Range: 1–1,000,000 N

Enter the allowable pulling tension for the exact cable construction, grip and pulling method.

Range: 1–10,000,000 N/m

Enter the allowable sidewall pressure for the exact cable and bend/sheave arrangement.

Result

Bend tension multiplication factor
1.369
Estimated exit tension (N)
405.4
Sidewall pressure margin (N/m)
48,648.5
Estimated sidewall pressure (N/m)
1,351.5
Estimated tension after straight run (N)
296.1
Pull tension margin (N)
9,594.6
Limit comparison
Both estimates are within the user-entered limits for this simplified route model.

Formula

Calculation logic

Formula definitions and substituted values.

Before relying on the result

  • Checking a planned pull before installation
  • Comparing a route or lubricant coefficient against manufacturer limits
  • Compare the estimated pull tension and sidewall pressure with the cable and installation equipment manufacturers' stated limits.

Related calculators

Compare the estimated pull tension and sidewall pressure with the cable and installation equipment manufacturers' stated limits.